<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .form {
            width: 220px;
            height: 220px;
            padding: 10px;
            border: 1px solid red;
            box-sizing: content-box;
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .d1 {
            flex: 1;
            border: 1px solid blue;
            text-align: center;
        }

        .d2 {
            flex: 2;
            border: 1px solid blue;
            text-align: center;
        }
    </style>
</head>
<body>

<div class="form">
    <div class="d1">1</div>
    <div class="d1">2</div>
    <div class="d2">3</div>
</div>

</body>
</html>
